SAP Message RSRD234 - Special character &1 in file name &2 not permitted

Diagnosis
File name "&V2&" contains illegal characters (for example &V1& ).
The file name can only contain ASCII letters in lower or upper case andthe underscore character '_'. The forward slash '/' is also used toseparate file names from (newly created) subdirectories, as are anglebrackets when using text variables.

System Response
The broadcast setting is incorrect and cannot be saved or executed.

Procedure
Specify a valid file name.